igb: fix vf lookup

commit 0629292117572a60465f38cdedde2f8164c3df0b upstream.

Recent addition of code to find already allocated VFs failed to take
account that systems with 2 or more multi-port SR-IOV capable controllers
might have already enabled VFs.  Make sure that the VFs the function is
finding are actually subordinate to the particular instance of the adapter
that is looking for them and not subordinate to some device that has
previously enabled SR-IOV.

This is applicable to 3.2+ kernels.

Reported-by: David Ahern <daahern@cisco.com>
Signed-off-by: Greg Rose <gregory.v.rose@intel.com>
Tested-by: Robert E Garrett <robertX.e.garrett@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index ced544499f1b0a8a3e7625dd88719bbc5592563f..222954dcdee93a6c22b555abd528cf195d7575e3 100644 (file)
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -4965,7 +4965,8 @@ static int igb_find_enabled_vfs(struct igb_adapter *adapter)
        vf_devfn = pdev->devfn + 0x80;
        pvfdev = pci_get_device(hw->vendor_id, device_id, NULL);
        while (pvfdev) {
-               if (pvfdev->devfn == vf_devfn)
+               if (pvfdev->devfn == vf_devfn &&
+                   (pvfdev->bus->number >= pdev->bus->number))
                        vfs_found++;
                vf_devfn += vf_stride;
                pvfdev = pci_get_device(hw->vendor_id,